CURT 5th Wheel Pin Box Towing Upgrade Flex AirCURT 5th Wheel Pin Box Towing Upgrade Flex Air

Upgrade with a CURT 5th Wheel Pin Box

Looking for an upgrade? Look no further than a CURT 5th wheel pin box! Not all 5th wheel pin boxes are created equally. In fact, with so much weight hanging in the balance, the right choice can make all the difference in the world in terms of ride comfort and control.

CURT offers a range of pin box options – from standard replacements to advanced shock-absorbing models – to provide you with the perfect solution to suit your needs, preferences and budget.

Ready to upgrade?

CURT Air Ride™ Pin Box Review by The Campoholics

CURT 5th Wheel Pin Box Comparison

CURT Rota-Flex 5th Wheel Pin BoxCURT Rota-Flex 5th Wheel Pin Box

Rota-Flex™

  • Pivoting head with integrated rubber compound to absorb shocks
  • Easy installation with no assembly required
  • 18K - 21K weight capacity options
CURT Air Ride 5th Wheel Pin BoxCURT Air Ride 5th Wheel Pin Box

Air Ride™

  • Internal airbag and built-in strut for enhanced shock absorption
  • Easy installation with no assembly required
  • 18K - 21K weight capacity options
CURT Flex Air 5th Wheel Pin BoxCURT Flex Air 5th Wheel Pin Box

Flex Air®

  • Both Rota-Flex and Air Ride technology in one for ultimate shock absorption
  • Easy installation with no assembly required
  • 18K - 21K weight capacity options

Shock-Absorbing Technology for Improved Comfort & Control

CURT Pivoting 5th Wheel Kingpin Rota-FlexCURT Pivoting 5th Wheel Kingpin Rota-Flex

Pivoting Head with Rubber Isolator

CURT Rota-Flex and Flex Air 5th wheel pin boxes are built with a pivoting head that allows the kingpin to articulate with the movement of the truck and trailer. An integrated rubber compound cushions this movement, absorbing shock and vibrations, resulting in a smoother ride for greater passenger comfort and improved driver control.

Built-in Air Bag & Strut

CURT Air Ride and Flex Air pin boxes are equipped with a built-in airbag and gas strut that provide enhanced shock absorption. Each pin box has a pivot point that allows the kingpin head piece to articulate in a scissor-like motion. As the truck and trailer pass over rough, uneven roads, the airbag and strut absorb jerking, jarring and vibrations at the coupling point.

CURT 5th Wheel Pin Box with Air Bag and Shock AbsorberCURT 5th Wheel Pin Box with Air Bag and Shock Absorber
Standard 5th Wheel Pin BoxStandard 5th Wheel Pin Box

Standard Replacement 5th Wheel Pin Boxes

If you’re looking for a basic 5th wheel pin box replacement, we also offer standard options with no shock-absorption upgrade. These standard pin boxes connect to virtually any 5th wheel hitch and are designed to bolt into place using existing hardware on the trailer. They are available in capacities up to 21,000 pounds.

How to Choose the Right 5th Wheel Pin Box

Replacing or upgrading your pin box is very easy to do, particularly when your existing pin box is a CURT or Lippert model. Follow the steps below and use the diagrams and table to choose the right size 5th wheel pin box for your RV.

  1. Look for the white sticker with a four-digit number on it. Example: 1621 or 1716
  2. What is the gross vehicle weight rating (GVWR) of the RV?
  3. Visually compare the illustration to the mounting wing on the trailer.
  4. Measure the length of the existing pin box from the front row of bolts to center of the kingpin.
  5. Measure all three bolt-pattern dimensions on existing pin box.
  6. Measure existing pin box width.

Pin Box Measurement Diagrams

5th Wheel Pin Box Diagram Three-Row Bolt Pattern5th Wheel Pin Box Diagram Three-Row Bolt Pattern
Three-Row Bolt Pattern
5th Wheel Pin Box Diagram Two-Row Bolt Pattern5th Wheel Pin Box Diagram Two-Row Bolt Pattern
Two-Row Bolt Pattern
Pin Box Width DiagramPin Box Width Diagram
Pin Box Width

OEM #

Industry #

Bolt Pattern

Bolt Head Size

Style

A

B
Zones

C
Monitoring

D

E

F

G

1621

L05

2-row

15/16"

Long

7-7/8"

2"

--

5/8"

17-3/4"

25-5/8"

12"

0719

M15

2-row

15/16"

Medium

7-7/8"

2"

--

5/8"

9"

16-7/8"

12"

1716

L07

3-row

15/16"

Long

8-3/4"

2-1/2"

4-3/8"

5/8"

20-3/8"

29-1/8"

12-1/2"

1116

M19

3-row

15/16"

Medium

8-3/4"

2-1/2"

4-3/8"

5/8"

14-5/8"

23-1/4"

12-1/2"

Still not sure what you need?

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